A. | preserved | B. | protected | C. | spread | D. | developed |
分析 在零下130℃,一個(gè)活細(xì)胞可以保存一千年的時(shí)間.
解答 答案A.B項(xiàng)"保護(hù)";C項(xiàng)"傳播,散布;展開(kāi);伸展;鋪開(kāi)";D項(xiàng)"發(fā)展,進(jìn)步;使成長(zhǎng),沖洗(膠片)"A項(xiàng)"保存,保持,維持";根據(jù)句子結(jié)構(gòu)分析及句意可知,這里考查含有情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài)"be+動(dòng)詞的過(guò)去分詞","被保存 sth be preserved",因此A項(xiàng)符合語(yǔ)境,故選A.
點(diǎn)評(píng) 本題考查動(dòng)詞的被動(dòng)語(yǔ)態(tài).被動(dòng)語(yǔ)態(tài)表示句子的主語(yǔ)是動(dòng)作的承受者,也就是動(dòng)作的對(duì)象,一般說(shuō)來(lái)只有及物動(dòng)詞才有被動(dòng)語(yǔ)態(tài).其構(gòu)成為"be+及物動(dòng)詞的過(guò)去分詞".助動(dòng)詞be有人稱(chēng)、數(shù)和時(shí)態(tài)的變化,其變化規(guī)則與be作為連系動(dòng)詞時(shí)完全一樣.含有情態(tài)動(dòng)詞的謂語(yǔ)變化為被動(dòng)語(yǔ)態(tài)時(shí),由"情態(tài)動(dòng)詞(can,may must,have to等)+be+動(dòng)詞的-ed形式.
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